The official working definition of HS is as follows:
“Hidradenitis suppurativa is a chronic, inflammatory, recurrent, debilitating skin disease of the hair follicle that usually presents after puberty with painful, deep-seated, inflamed lesions in the apocrine gland-bearing areas of the body, most commonly the axillae, inguinal and anogenital regions”.
Dessau definition, 1st International Conference on Hidradenitis suppurativa/Acne inversa, March 30-April 1, 2006, Dessau, Germany. [ Kurzen et al 2008 and/or Zouboulis et al, 2015]